Mitsubishi SRK Series Technical Manual
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Mitsubishi SRK Series Technical Manual

Inverter wall mounted type residential air-conditioners (split system, air to air heat pump type)
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TECHNICAL MANUAL
INVERTER WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS
(Split system, air to air heat pump type)
SRK20ZS-W, -WB, -WT
25ZS-W, -WB, -WT
35ZS-W, -WB, -WT
50ZS-W, -WB, -WT
Manual No.'18•SRK-T-250

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Summary of Contents for Mitsubishi SRK Series

  • Page 1 Manual No.'18•SRK-T-250 TECHNICAL MANUAL INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS (Split system, air to air heat pump type) SRK20ZS-W, -WB, -WT 25ZS-W, -WB, -WT 35ZS-W, -WB, -WT 50ZS-W, -WB, -WT...

  • Page 2: Table Of Contents

    '18 • SRK-T-250 CONTENTS 1. SPECIFICATIONS ..................2. EXTERIOR DIMENSIONS ................. (1) Indoor units ..................(2) Outdoor units ..................(3) Remote control ..................19 3. ELECTRICAL WIRING ................22 (1) Indoor units ..................... 22 (2) Outdoor units ................... 23 4. NOISE LEVEL ....................25 5.
  • Page 3 '18 • SRK-T-250 (20) Protective control function ............... 72 10. MAINTENANCE DATA ................... 79 (1) Cautions ....................79 (2) Items to check before troubleshooting ............ 79 (3) Troubleshooting procedure (If the air-conditioner does not run at all) ... 79 ......80 (4) Troubleshooting procedure (If the air-conditioner runs) (5) Self-diagnosis table .................

  • Page 4: Specifications

    '18 • SRK-T-250 1. SPECIFICATIONS SRK20ZS-W Model Item Indoor unit SRK20ZS-W Outdoor unit SRC20ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 2.0 ( 0.9 (Min.) - 2.9 (Max.)) Nominal heating capacity (range) 2.7 ( 0.9 (Min.) - 4.3 (Max.)) Heating capacity (H2) —...
  • Page 5 '18 • SRK-T-250 SRK25ZS-W Model Item Indoor unit SRK25ZS-W Outdoor unit SRC25ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 2.5 ( 0.9 (Min.) - 3.1 (Max.)) Nominal heating capacity (range) 3.2 ( 0.9 (Min.) - 4.5 (Max.)) Heating capacity (H2) —...
  • Page 6 '18 • SRK-T-250 SRK35ZS-W Model Item Indoor unit SRK35ZS-W Outdoor unit SRC35ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 3.5 ( 0.9 (Min.) - 4.0 (Max.)) Nominal heating capacity (range) 4.0 ( 0.9 (Min.) - 5.0 (Max.)) Heating capacity (H2) —...
  • Page 7 '18 • SRK-T-250 SRK50ZS-W Model Item Indoor unit SRK50ZS-W Outdoor unit SRC50ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 5.0 ( 1.3 (Min.) - 5.5 (Max.)) Nominal heating capacity (range) 5.8 ( 1.3 (Min.) - 6.6 (Max.)) Heating capacity (H2) —...
  • Page 8 '18 • SRK-T-250 SRK20ZS-WB Model Item Indoor unit SRK20ZS-WB Outdoor unit SRC20ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 2.0 ( 0.9 (Min.) - 2.9 (Max.)) Nominal heating capacity (range) 2.7 ( 0.9 (Min.) - 4.3 (Max.)) Heating capacity (H2) —...
  • Page 9 '18 • SRK-T-250 SRK25ZS-WB Model Item Indoor unit SRK25ZS-WB Outdoor unit SRC25ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 2.5 ( 0.9 (Min.) - 3.1 (Max.)) Nominal heating capacity (range) 3.2 ( 0.9 (Min.) - 4.5 (Max.)) Heating capacity (H2) —...
  • Page 10 '18 • SRK-T-250 SRK35ZS-WB Model Item Indoor unit SRK35ZS-WB Outdoor unit SRC35ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 3.5 ( 0.9 (Min.) - 4.0 (Max.)) Nominal heating capacity (range) 4.0 ( 0.9 (Min.) - 5.0 (Max.)) Heating capacity (H2) —...
  • Page 11 '18 • SRK-T-250 SRK50ZS-WB Model Item Indoor unit SRK50ZS-WB Outdoor unit SRC50ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 5.0 ( 1.3 (Min.) - 5.5 (Max.)) Nominal heating capacity (range) 5.8 ( 1.3 (Min.) - 6.6 (Max.)) Heating capacity (H2) —...
  • Page 12 '18 • SRK-T-250 SRK20ZS-WT Model Item Indoor unit SRK20ZS-WT Outdoor unit SRC20ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 2.0 ( 0.9 (Min.) - 2.9 (Max.)) Nominal heating capacity (range) 2.7 ( 0.9 (Min.) - 4.3 (Max.)) Heating capacity (H2) —...
  • Page 13 '18 • SRK-T-250 SRK25ZS-WT Model Item Indoor unit SRK25ZS-WT Outdoor unit SRC25ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 2.5 ( 0.9 (Min.) - 3.1 (Max.)) Nominal heating capacity (range) 3.2 ( 0.9 (Min.) - 4.5 (Max.)) Heating capacity (H2) —...
  • Page 14 '18 • SRK-T-250 SRK35ZS-WT Model Item Indoor unit SRK35ZS-WT Outdoor unit SRC35ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 3.5 ( 0.9 (Min.) - 4.0 (Max.)) Nominal heating capacity (range) 4.0 ( 0.9 (Min.) - 5.0 (Max.)) Heating capacity (H2) —...
  • Page 15 '18 • SRK-T-250 SRK50ZS-WT Model Item Indoor unit SRK50ZS-WT Outdoor unit SRC50ZS-W Power source 1 Phase, 220 - 240V, 50Hz / 220V, 60Hz Nominal cooling capacity (range) 5.0 ( 1.3 (Min.) - 5.5 (Max.)) Nominal heating capacity (range) 5.8 ( 1.3 (Min.) - 6.6 (Max.)) Heating capacity (H2) —...
  • Page 16 '18 • SRK-T-250 Packing material weight list Unit: kg Material Packing Metal Paper Gross Parts Glass Plastic Wood Other Weight weight Aluminium Steel board Model (Total) SRK20ZS-W 11.5 1.21 0.00 0.33 0.88 0.00 0.00 0.00 0.00 SRK25ZS-W 11.5 1.21 0.00 0.33 0.88 0.00...

  • Page 17: Exterior Dimensions

    '18 • SRK-T-250 2. EXTERIOR DIMENSIONS (1) Indoor units Models SRK20ZS-W, 25ZS-W, 35ZS-W, 50ZS-W SRK20ZS-WB, 25ZS-WB, 35ZS-WB, 50ZS-WB SRK20ZS-WT, 25ZS-WT, 35ZS-WT, 50ZS-WT RLF000Z103...

  • Page 18: Outdoor Units

    '18 • SRK-T-250 (2) Outdoor units Models SRC20ZS-W, 25ZS-W, 35ZS-W RCV000Z036...
  • Page 19 '18 • SRK-T-250 Model SRC50ZS-W RCV000Z037...

  • Page 20: Remote Control

    '18 • SRK-T-250 (3) Remote control (a) Wireless remote control Unit : mm...
  • Page 21 '18 • SRK-T-250 (b) Wired remote control (Option parts) Interface kit (SC-BIKN2-E) is required to use the wired remote control. Model RC-EX3A Installation space Dimensions (Viewed from front) 30mm 30mm Wiring 配線 30mm 30mm 30mm 30mm Fixing holes 固定穴 R/C temperature sensor Secure minimum spaces for disassembling the case.
  • Page 22 '18 • SRK-T-250 Model RC-E5 Wiring outlet Cut off the upper thin part of remote control lower case with a nipper or knife, and grind burrs with a file etc. Exposed mounting In case of pulling out In case of pulling out from upper left from center 0.3mm...

  • Page 23: Electrical Wiring

    '18 • SRK-T-250 3. ELECTRICAL WIRING (1) Indoor units Models SRK20ZS-W, 25ZS-W, 35ZS-W, 50ZS-W SRK20ZS-WB, 25ZS-WB, 35ZS-WB, 50ZS-WB SRK20ZS-WT, 25ZS-WT, 35ZS-WT, 50ZS-WT RWA000Z416...

  • Page 24: Outdoor Units

    '18 • SRK-T-250 (2) Outdoor units Models SRC20ZS-W, 25ZS-W, 35ZS-W RWC000Z315...
  • Page 25 '18 • SRK-T-250 Model SRC50ZS-W RWC000Z316...

  • Page 26: Noise Level

    '18 • SRK-T-250 4. NOISE LEVEL (1) Sound power level Model SRK20ZS-W, -WB, -WT ISO5151 T1/H1 （Indoor unit） Condition Model SRK20ZS-W,WB,WT Noise Cooling MODE Rated capacity value 48 dB(A) Level Heating 50 dB(A) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) （Outdoor unit）...
  • Page 27 '18 • SRK-T-250 Model SRK25ZS-W, -WB, -WT （Indoor unit） ISO5151 T1/H1 Condition Model SRK25ZS-W,WB,WT Noise Cooling MODE Rated capacity value 50 dB(A) Level Heating 53 dB(A) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) （Outdoor unit） Model SRC25ZS-W Noise...
  • Page 28 '18 • SRK-T-250 Model SRK35ZS-W, -WB, -WT （Indoor unit） ISO5151 T1/H1 Condition Model SRK35ZS-W,WB,WT Noise Cooling MODE Rated capacity value 54 dB(A) Level Heating 56 dB(A) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) （Outdoor unit） Model SRC35ZS-W Noise...
  • Page 29 '18 • SRK-T-250 Model SRK50ZS-W, -WB, -WT （Indoor unit） ISO5151 T1/H1 Condition Model SRK50ZS-W,WB,WT Noise Cooling Rated capacity value MODE 59 dB(A) Level Heating 60 dB(A) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) （Outdoor unit） Model SRC50ZS-W Noise...
  • Page 30 '18 • SRK-T-250 (2) Sound pressure level (a) Rated capacity value ISO5151 T1/H1 Condition Model SRK20ZS-W, -WB, -WT MODE Rated capacity value Mike position （Indoor unit） Model SRK20ZS-W,WB,WT 0.8m Noise Cooling 34 dB(A) Unit Mike position Level Heating 36 dB(A) (Center &...
  • Page 31 '18 • SRK-T-250 Model SRK25ZS-W, -WB, -WT ISO5151 T1/H1 Condition MODE Rated capacity value Mike position （Indoor unit） Model SRK25ZS-W,WB,WT 0.8m Noise Cooling 36 dB(A) Unit Mike position Level Heating 39 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000...
  • Page 32 '18 • SRK-T-250 Model SRK35ZS-W, -WB, -WT ISO5151 T1/H1 Condition MODE Rated capacity value Mike position （Indoor unit） Model SRK35ZS-W,WB,WT 0.8m Noise Cooling 40 dB(A) Unit Mike position Level Heating (Center & low points) 41 dB(A) × Cooling ○ Heating 1000 2000 4000...
  • Page 33 '18 • SRK-T-250 Model SRK50ZS-W, -WB, -WT ISO5151 T1/H1 Condition MODE Rated capacity value Mike position （Indoor unit） Model SRK50ZS-W,WB,WT 0.8m Noise Cooling 46 dB(A) Unit Mike position Level Heating 46 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000...
  • Page 34 '18 • SRK-T-250 (b) Each fan speed mode ISO5151 T1/H1 Condition MODE Mike position （Indoor unit） Model SRK20ZS-W,WB,WT 0.8m Noise Cooling 34 dB(A) Unit Mike position Level Heating 36 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz)
  • Page 35 '18 • SRK-T-250 ISO5151 T1/H1 Condition MODE Mike position （Indoor unit） Model SRK20ZS-W,WB,WT 0.8m Noise Cooling 22 dB(A) Unit Mike position Level Heating 23 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) MODE （Indoor unit）...
  • Page 36 '18 • SRK-T-250 ISO5151 T1/H1 Condition MODE Mike position （Indoor unit） Model SRK25ZS-W,WB,WT 0.8m Noise Cooling 36 dB(A) Unit Mike position Level Heating 39 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) MODE （Indoor unit）...
  • Page 37 '18 • SRK-T-250 ISO5151 T1/H1 Condition MODE Mike position （Indoor unit） Model SRK25ZS-W,WB,WT 0.8m Noise Cooling 23 dB(A) Unit Mike position Level Heating 24 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) MODE （Indoor unit）...
  • Page 38 '18 • SRK-T-250 ISO5151 T1/H1 Condition MODE Mike position （Indoor unit） Model SRK35ZS-W,WB,WT 0.8m Noise Cooling 40 dB(A) Unit Mike position Level Heating 41 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) MODE （Indoor unit）...
  • Page 39 '18 • SRK-T-250 ISO5151 T1/H1 Condition MODE Mike position （Indoor unit） Model SRK35ZS-W,WB,WT 0.8m Noise Cooling 26 dB(A) Unit Mike position Level Heating 25 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) MODE （Indoor unit）...
  • Page 40 '18 • SRK-T-250 ISO5151 T1/H1 Condition MODE Mike position （Indoor unit） Model SRK50ZS-W,WB,WT 0.8m Noise Cooling 46 dB(A) Unit Mike position Level Heating 46 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) MODE （Indoor unit）...
  • Page 41 '18 • SRK-T-250 ISO5151 T1/H1 Condition MODE Mike position （Indoor unit） Model SRK50ZS-W,WB,WT 0.8m Noise Cooling 29 dB(A) Unit Mike position Level Heating 31 dB(A) (Center & low points) × Cooling ○ Heating 1000 2000 4000 8000 Mid octave band frequency (Hz) MODE （Indoor unit）...
  • Page 42 '18 • SRK-T-250 ISO5151 T1/H1 Condition （Outdoor unit） Mike position: at highest noise level in position as mentioned below Model SRC20ZS-W Distance from front side 1m Noise Cooling 42 dB(A) MODE Silent Level Heating 43 dB(A) × Cooling ○ Heating 1000 2000 4000...
  • Page 43 '18 • SRK-T-250 ISO5151 T1/H1 Condition （Outdoor unit） Mike position: at highest noise level in position as mentioned below Model SRC35ZS-W Distance from front side 1m Noise Cooling 45 dB(A) MODE Silent Level Heating 44 dB(A) × Cooling ○ Heating 1000 2000 4000...

  • Page 44: Piping System

    '09•SRK-DB-087D '18 • SRK-T-250 5. PIPING SYSTEM 5 PIPING SYSTEM Models SRK20ZS-W, 25ZS-W Models SRK20ZS-S, 25ZS-S SRK20ZS-WB, 25ZS-WB SRK20ZS-WT, 25ZS-WT pipe 4-way valve Models SRK35ZS-W Model SRK35ZS-S SRK35ZS-WB SRK35ZS-WT pipe 4-way valve Humidity sensor (HD)
  • Page 45 '18 • SRK-T-250 Models SRK50ZS-W Model SRK50ZM-S SRK50ZS-WB SRK50ZS-WT Cooling cycle Heating cycle Indoor unit Outdoor unit Outdoor air Flare temp. sensor connection Service valve (TH2) (Gas) Discharge pipe temp. sensor Gas pipe Check joint Heat (TH3) (φ12.7) Room temp. exchanger sensor sensor...

  • Page 46: Range Of Usage & Limitations

    '18 • SRK-T-250 6. RANGE OF USAGE & LIMITATIONS RANGE OF USAGE & LIMITATIONS Model SRK20,25,35ZS-W SRK50ZS-W SRK20,25,35ZS-WB SRK50ZS-WB SRK20,25,35ZS-WT SRK50ZS-WT Item Cooling operation : Approximately 18 to 32℃ D.B. Indoor return air temperature Heating operation : Approximately 10 to 30℃ D.B. (Upper, lower limits) (Refer to the selection chart) Cooling operation : Approximately -15 to 46℃...
  • Page 47 '09•SRK-DB-087D '18 • SRK-T-250 (2) Correction of cooling and heating capacity in relation to one way length of refrigerant piping Piping length [m] Cooling 0.99 0.975 0.965 0.95 Heating (3) Correction relative to frosting on outdoor heat exchanger during heating Air inlet temperature of 5 or more outdoor unit in °C WB...

  • Page 48: Capacity Tables

    '18 • SRK-T-250 7. CAPACITY TABLES Models SRK20ZS-W, -WB, -WT Cooling mode (kW) Heating mode (HC) (kW) Indoor air temperature Outdoor Indoor air temperature Outdoor 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Air flow Air flow temperature 14˚CWB 16˚CWB 18˚CWB 19˚CWB 20˚CWB 22˚CWB...

  • Page 49: Application Data

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  • Page 57: Installation Of Outdoor Unit

    '18 • SRK-T-250 (2) Installation of outdoor unit RWC012A068...
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  • Page 61: Safety Precautions In Handling Air-Conditioners With Flammable Refrigerants

    '18 • SRK-T-250 (3) Safety precautions in handling air-conditioners with flammable refrigerants RSA012A061A WALL TYPE AIR-CONDITIONER R32 REFRIGERANT USED There is information included in the user’s manual and/or is leaked, together with an external ignition source, there is a installation manual. possibility of ignition.
  • Page 62 '18 • SRK-T-250 CAUTION • 6. Repair to intrinsically safe components 13. Labelling • Do not apply any permanent inductive or • Equipment shall be labelled stating that it has been capacitance loads to the circuit without ensuring de-commissioned and emptied of refrigerant. The the working pressure is achieved, then venting to that this will not exceed the permissible voltage and label shall be dated and signed.

  • Page 63: Outline Of Operation Control By Microcomputer

    '18 • SRK-T-250 9. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by wireless remote control Transmission section Operation section ON/OFF (luminous) button Press to start operation, press again to stop. OPERATION MODE select button Each time the button is pressed, the FAN SPEED button mode changes.

  • Page 64: Unit On/Off Button

    '09•SRK-DB-087D '09•SRK-DB-087D '18 • SRK-T-250 (2) Unit ON/OFF button (2) Unit ON/OFF button wireless wireless (a) Operation (a) Operation (b) Details of operation (b) Details of operation room whether to go into the COOL or HEAT modes. Function Room temperature Function Indoor temperature Fan speed Flap/Louver Timer switch...

  • Page 65: Selection Of The Annual Cooling Function

    '18 • SRK-T-250 J1 用 J3 用 (5) Selection of the annual cooling function Jumper wire (J1) Jumper wire (J3) (a) The annual cooling control is valid from factory default setting. It is possible to disable by cutting jumper wire (J3), or changing the setting of dip switch (SW2- 4) on the interface kit (option) PCB if it is connected.

  • Page 66: Economy Operation

    '18 • SRK-T-250 (8) Economy operation Pressing the HI POWER/ECONOMY button initiates a soft operation with the power suppressed in order to avoid an excessive cooling or heating. The unit operate 1.5℃ higher than the setting temperature during cooling or 2.5℃ lower than that during heating. The wireless remote control displays ECONOMY mark and the FAN SPEED display disappears.

  • Page 67: Auto Operation

    control display Center installation Left approx. 50° Left approx. 20° Center Right approx. 20° Right approx. 50° '18 • SRK-T-250 Right end installation Left approx. 50° Left approx. 45° Left approx. 30° Center Right approx. 20° Left end installation Left approx. 20° Center Right approx.

  • Page 68: Timer Operation

    Cooling Heating '18 • SRK-T-250 Flap Up/down swing Louver Center (Fixed) Cooling Heating Flap Horizontal blowing (Fixed) Slant forwardl blowing (Fixed) Louver Wide (Fixed) room Operation mode Air flow direction contorol < = < = Room temp. – Setting temp. 2°C 2°C <...

  • Page 69: Air Flow Range Setting

    The OFF timer can be set at a specific time (in 10-minute units) within a 24-hour period. (c) OFF timer operation The OFF timer can be set at a specific time (in 10-minute units) within a 24-hour period. (d) Weekly timer operation '18 •...

  • Page 70: Outline Of Heating Operation

    '09•SRK-DB-087D '18 • SRK-T-250 (16) Outline of heating operation (a) Operation of major functional components in heating mode Heating Thermostat ON Thermostat OFF Failure Compressor Indoor fan motor ON(HOT KEEP)* Outdoor fan motor (few minutes ON) 4-way valve (3 minutes ON) *It can be set the indoor fan motor off or the heating thermostat OFF with connecting a wired remote control.

  • Page 71: Outline Of Cooling Operation

    is as following. '18 • SRK-T-250 In case satisfied all of following conditions. • Connect compressor speed 0 rps 10 times or more. • Satisfy 1), 2) and 3) conditions above. • Outdoor air temperature is 3°C or less. (ii) is satisfied.) (model SRK50 : 10 ) Continued operation time of defrost operation →...

  • Page 72: Outline Of Dehumidifying (Dry) Opertaion

    '18 • SRK-T-250 '09•SRK-DB-087D (18)　Outline of dehumidifying (DRY) operation (d) Countermeasure for excessive temperature rise If it feels excessive temperature rise in heating operation, setting temperature can be lower. (a) Purpose of DRY mode The purpose is "Dehumidification", and not to control the humidity to the target condition. Indoor/outdoor unit control the operation condition to reduce the humidity, and also prevent over cooling.

  • Page 73: Protective Control Function

    '18 • SRK-T-250 (20) Protective control function Dew prevention control (During cooling) Prevents dewing on the indoor unit. (SRK35, 50 only) Operating conditions When the following conditions have been satisfied for more than 30 minutes after starting operation Compressor’s speed is 32 (model SRK50:28) rps or higher. Detected value of humidity is 68% or higher.
  • Page 74 (iii) Reset conditions '18 • SRK-T-250 (c) Cooling overload protective control Operating conditions When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41°C or more, or 47ºC or more with the compressor running, the lower limit speed of compressor is brought up. Model SRK20-35 SRK50...
  • Page 75 It checks the outdoor temperature (TH2) once every hour to judge the operation range. Range A Compressor speed: Upper/lower limit (rps) Lower 1 Range B Upper 1 Lower 2 Upper 2 Lower 3 Upper 3 Range B Range A '18 • SRK-T-250 SRK20, 25, 35 Release −...
  • Page 76 '18 • SRK-T-250 (g) Heating overload protective control Outdoor unit side • Models SRK20, 25, 35 Operating conditions When the outdoor air temperature (TH2) is 22°C or higher continues for 30 seconds while the compressor speed other than 0 rps. Detail of operation Taking the upper limit of compressor speed at 60 rps, if the output speed obtained with the fuzzy calculation exceeds the upper limit, the upper limit value is maintained.
  • Page 77 Outdoor air temperature(°C) '18 • SRK-T-250 Reset conditions: (h) Heating low outdoor temperature protective control • Models SRK20, 25, 35 (i)  Operating conditions When the outdoor air temperature (TH2) is lower than 2°C or higher continues for 30 seconds while the compressor speed is other than 0 rps.
  • Page 78 '18 • SRK-T-250 Discharge pipe temperature (˚C) 100 -110°C 90 -100°C 90 -100°C Item Cooling Heating Model SRK20 - 35 15 rps 20 rps Lower limit speed 20 rps 20 rps SRK50 has elapsed Current safe Purpose (ii) Detail of operation (k) Current cut Purpose (ii)
  • Page 79 Rotor lock '18 • SRK-T-250 Outdoor fan motor protection Outdoor fan control at low outdoor temperature Cooling Operating conditions Detail of operation Outdoor fan Outdoor temperature > 10˚C Outdoor temperature < = 10˚C 21°C -38°C Reset conditions (ii) Heating Operating conditions 0°C Detail of operation Reset conditions...

  • Page 80: Maintenance Data

    '09•SRK-DB-087D '18 • SRK-T-250 Reference Reference 10. MAINTENANCE DATA 2 TROUBLESHOOTING PROCEDURES FOR ELECTRICAL EQUIPMENT (1) Cautions (2) Items to check before troubleshooting source (3) Troubleshooting procedure (If the air-conditioner does not run at all) Important satisfied 198 - 264 source wireless proced-...

  • Page 81: Troubleshooting Procedure (If The Air-Conditioner Runs)

    '09•SRK-DB-087D '18 • SRK-T-250 (4) Troubleshooting procedure (If the air-conditioner runs) service 82 - 88. service 82 - 88.

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